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Developing Neuroimaging Phenotypes of the Default Mode Network in PTSD: Integrating the Resting State, Working Memory, and Structural Connectivity

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Disrupted intrinsic functional connectivity in the vegetative state.

F Cauda¹, B M Micon, K Sacco

¹CCS fMRI, Koelliker Hospital, Torino, Italy. franco.cauda@unito.it

Journal of Neurology, Neurosurgery, and Psychiatry

|March 18, 2009

Summary

This summary is machine-generated.

Resting brain activity in persistent vegetative state (PVS) patients shows a dysfunctional default mode network. This suggests the resting state is crucial for self-consciousness, particularly in the right hemisphere.

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Area of Science:

Neuroscience
Cognitive Neuroscience
Clinical Neurology

Background:

Spontaneous brain activity during rest is debated to reflect conscious thought or intrinsic organization.
The default mode network (DMN) is a key network active during rest.

Purpose of the Study:

To investigate the functional connectivity of the default mode network in patients with persistent vegetative state (PVS).
To explore the role of the resting state and DMN in consciousness.

Main Methods:

Functional magnetic resonance imaging (fMRI) was used to assess blood-oxygen-level dependent (BOLD) fluctuations.
Connectivity analysis of the default mode network was performed in three PVS patients.

Main Results:

PVS patients exhibited a dysfunctional DMN with reduced connectivity.
Decreased connectivity was observed in the dorsolateral prefrontal cortex and anterior cingulate cortex, notably in the right hemisphere.
Findings suggest the resting state, particularly right-hemisphere DMN activity, is linked to consciousness.

Conclusions:

The resting state default mode network is impaired in persistent vegetative state.
Right-hemisphere DMN function may be critical for conscious processes.
The DMN could serve as a potential biomarker for assessing awareness in PVS.